Laboratory cultivation of gemstones is that engineers analyze and master the chemical composition, physical characteristics and natural causes of natural gemstones, and simulate the natural formation environment of natural gemstones in the laboratory, so as to cultivate gemstones that are completely consistent with the composition and characteristics of natural gemstones.
Human beings have been cultivating gemstones in the laboratory for more than 100 years. At the beginning of last century, Werner Ye created the flame melting method and cultivated gemstones such as red sapphire. However, because its hue, saturation and permeability can not reach the gem level standard, it is generally used in the manufacture of precision instruments such as clocks and watches.
However, people's pursuit of beauty and scientific exploration have never stopped, and there has been a new breakthrough in the research of cultivating gemstones. After many experiments, the researchers applied the new long crystal process in the field of semiconductor laser crystal to the cultivation and growth of colored gemstones. The cultivated ruby, sapphire and emerald are comparable to natural high-quality ruby, sapphire and emerald in physical, chemical properties and visual effect. It is difficult to distinguish the difference between them with the naked eye.
In March 2019, a laboratory grown Ruby and sapphire based on femtosecond laser crystal cultivation technology appeared in the spring Hong Kong International Jewelry Exhibition. The characteristic parameters of the ruby and sapphire cultivated by this technology are basically consistent with those of natural gemstones, which has attracted extensive attention in the industry.
The cut gemstones cut and polished by cultivated gemstones are almost the same as natural gemstones in appearance, but the price is quite different, which is only 1 / 4-1 / 8 of the price of natural gemstones.
At present, the types of gemstones that can be cultivated in the laboratory include diamond, red sapphire and emerald. The common methods of cultivating diamonds are high temperature and high pressure method (HPHT method) and vapor deposition method (CVD method); The common methods of cultivating ruby, sapphire and emerald include hydrothermal method, cosolvent method and so on.
In addition to quality and price, there is also an important factor for the growing acceptance of cultivated gemstones. That is, the cultivation process of cultivating gemstones is environment-friendly, and the unit energy consumption and environmental damage are far less than the mining activities of natural gemstones.